I wrap the wire around the bead and then just roll the whole thing in the flame--it forms those little beads all by itself. Spot heating the end of the wire doesn't really work at that fine a gauge. The molten ends will either fume away or drip off onto the bench, and either way the wire itself will burn your hand. Silver is very heat-conductive, so heat the bead, touch one end of the wire piece to the hot glass to anchor it, wrap quickly while out of the flame (preferably holding the free end of the wire with tweezers or hemostat) and then reheat gently to get that beading-up action.
Also, if you're using cobalt blue transparent, Hades, or another reactive color, try using a reducing flame (more propane than oxy), which might get you some interesting colors.
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